package com.itheima.reggie.service.impl;

import com.baomidou.mybatisplus.core.conditions.query.LambdaQueryWrapper;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.itheima.reggie.common.CustomException;
import com.itheima.reggie.common.R;
import com.itheima.reggie.entity.Category;
import com.itheima.reggie.entity.Dish;
import com.itheima.reggie.entity.Setmeal;
import com.itheima.reggie.mapper.CategoryMapper;
import com.itheima.reggie.mapper.DishMapper;
import com.itheima.reggie.mapper.SetmealMapper;
import com.itheima.reggie.service.CategoryService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

@Service
public class CategoryServiceImpl extends ServiceImpl<CategoryMapper, Category> implements CategoryService {

    @Autowired
    private DishMapper dishMapper;

    @Autowired
    private SetmealMapper setmealMapper;

    @Override
    public void remove(Long id) {
        //1. 判断当前分类下是否存在菜品 Dish
        LambdaQueryWrapper<Dish> dishLambdaQueryWrapper = new LambdaQueryWrapper<>();
        dishLambdaQueryWrapper.eq(Dish::getCategoryId, id);
        Integer dishCount = dishMapper.selectCount(dishLambdaQueryWrapper);

        //2. 如果存在, 不能删除, 提示错误信息
        if(dishCount > 0){
            throw new CustomException("当前分类下关联有菜品, 不能直接删除 !");
        }

        //3. 判断当前分类下是否存在套餐 Setmeal
        LambdaQueryWrapper<Setmeal> setmealLambdaQueryWrapper = new LambdaQueryWrapper<>();
        setmealLambdaQueryWrapper.eq(Setmeal::getCategoryId, id);
        Integer setmealCount = setmealMapper.selectCount(setmealLambdaQueryWrapper);

        //4. 如果存在, 不能删除, 提示错误信息
        if(setmealCount > 0){
            throw new CustomException("当前分类下关联有套餐, 不能直接删除 !");
        }

        //5. 删除分类数据
        this.removeById(id);
    }

}
